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;; Predicate definitions for POWER and PowerPC.

;; Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.

;;

;; This file is part of GCC.

;;

;; GCC is free software; you can redistribute it and/or modify

;; it under the terms of the GNU General Public License as published by

;; the Free Software Foundation; either version 3, or (at your option)

;; any later version.

;;

;; GCC is distributed in the hope that it will be useful,

;; but WITHOUT ANY WARRANTY; without even the implied warranty of

;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

;; GNU General Public License for more details.

;;

;; You should have received a copy of the GNU General Public License

;; along with GCC; see the file COPYING3.  If not see

;; .

;; Return 1 for anything except PARALLEL.

(define_predicate "any_operand"

  (match_code "const_int,const_double,const,symbol_ref,label_ref,subreg,reg,mem"))

;; Return 1 for any PARALLEL.

(define_predicate "any_parallel_operand"

  (match_code "parallel"))

;; Return 1 if op is COUNT register.

(define_predicate "count_register_operand"

  (and (match_code "reg")

       (match_test "REGNO (op) == CTR_REGNO

                    || REGNO (op) > LAST_VIRTUAL_REGISTER")))

;; Return 1 if op is an Altivec register.

(define_predicate "altivec_register_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || ALTIVEC_REGNO_P (REGNO (op))

                     || REGNO (op) > LAST_VIRTUAL_REGISTER")))

;; Return 1 if op is a VSX register.

(define_predicate "vsx_register_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || VSX_REGNO_P (REGNO (op))

                     || REGNO (op) > LAST_VIRTUAL_REGISTER")))

;; Return 1 if op is a vector register that operates on floating point vectors

;; (either altivec or VSX).

(define_predicate "vfloat_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || VFLOAT_REGNO_P (REGNO (op))

                     || REGNO (op) > LAST_VIRTUAL_REGISTER")))

;; Return 1 if op is a vector register that operates on integer vectors

;; (only altivec, VSX doesn't support integer vectors)

(define_predicate "vint_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || VINT_REGNO_P (REGNO (op))

                     || REGNO (op) > LAST_VIRTUAL_REGISTER")))

;; Return 1 if op is a vector register to do logical operations on (and, or,

;; xor, etc.)

(define_predicate "vlogical_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || VLOGICAL_REGNO_P (REGNO (op))

                     || REGNO (op) > LAST_VIRTUAL_REGISTER")))

;; Return 1 if op is XER register.

(define_predicate "xer_operand"

  (and (match_code "reg")

       (match_test "XER_REGNO_P (REGNO (op))")))

;; Return 1 if op is a signed 5-bit constant integer.

(define_predicate "s5bit_cint_operand"

  (and (match_code "const_int")

       (match_test "INTVAL (op) >= -16 && INTVAL (op) <= 15")))

;; Return 1 if op is a unsigned 5-bit constant integer.

(define_predicate "u5bit_cint_operand"

  (and (match_code "const_int")

       (match_test "INTVAL (op) >= 0 && INTVAL (op) <= 31")))

;; Return 1 if op is a signed 8-bit constant integer.

;; Integer multiplication complete more quickly

(define_predicate "s8bit_cint_operand"

  (and (match_code "const_int")

       (match_test "INTVAL (op) >= -128 && INTVAL (op) <= 127")))

;; Return 1 if op is a constant integer that can fit in a D field.

(define_predicate "short_cint_operand"

  (and (match_code "const_int")

       (match_test "satisfies_constraint_I (op)")))

;; Return 1 if op is a constant integer that can fit in an unsigned D field.

(define_predicate "u_short_cint_operand"

  (and (match_code "const_int")

       (match_test "satisfies_constraint_K (op)")))

;; Return 1 if op is a constant integer that cannot fit in a signed D field.

(define_predicate "non_short_cint_operand"

  (and (match_code "const_int")

       (match_test "(unsigned HOST_WIDE_INT)

                    (INTVAL (op) + 0x8000) >= 0x10000")))

;; Return 1 if op is a positive constant integer that is an exact power of 2.

(define_predicate "exact_log2_cint_operand"

  (and (match_code "const_int")

       (match_test "INTVAL (op) > 0 && exact_log2 (INTVAL (op)) >= 0")))

;; Return 1 if op is a register that is not special.

(define_predicate "gpc_reg_operand"

   (and (match_operand 0 "register_operand")

        (match_test "(GET_CODE (op) != REG

                      || (REGNO (op) >= ARG_POINTER_REGNUM

                          && !XER_REGNO_P (REGNO (op)))

                      || REGNO (op) < MQ_REGNO)

                     && !((TARGET_E500_DOUBLE || TARGET_SPE)

                          && invalid_e500_subreg (op, mode))")))

;; Return 1 if op is a register that is a condition register field.

(define_predicate "cc_reg_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || REGNO (op) > LAST_VIRTUAL_REGISTER

                     || CR_REGNO_P (REGNO (op))")))

;; Return 1 if op is a register that is a condition register field not cr0.

(define_predicate "cc_reg_not_cr0_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || REGNO (op) > LAST_VIRTUAL_REGISTER

                     || CR_REGNO_NOT_CR0_P (REGNO (op))")))

;; Return 1 if op is a register that is a condition register field and if generating microcode, not cr0.

(define_predicate "cc_reg_not_micro_cr0_operand"

   (and (match_operand 0 "register_operand")

        (match_test "GET_CODE (op) != REG

                     || REGNO (op) > LAST_VIRTUAL_REGISTER

                     || (rs6000_gen_cell_microcode && CR_REGNO_NOT_CR0_P (REGNO (op)))

                     || (!rs6000_gen_cell_microcode && CR_REGNO_P (REGNO (op)))")))

;; Return 1 if op is a constant integer valid for D field

;; or non-special register register.

(define_predicate "reg_or_short_operand"

  (if_then_else (match_code "const_int")

    (match_operand 0 "short_cint_operand")

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is a constant integer valid whose negation is valid for

;; D field or non-special register register.

;; Do not allow a constant zero because all patterns that call this

;; predicate use "addic r1,r2,-const" to set carry when r2 is greater than

;; or equal to const, which does not work for zero.

(define_predicate "reg_or_neg_short_operand"

  (if_then_else (match_code "const_int")

    (match_test "satisfies_constraint_P (op)

                 && INTVAL (op) != 0")

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is a constant integer valid for DS field

;; or non-special register.

(define_predicate "reg_or_aligned_short_operand"

  (if_then_else (match_code "const_int")

    (and (match_operand 0 "short_cint_operand")

         (match_test "!(INTVAL (op) & 3)"))

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is a constant integer whose high-order 16 bits are zero

;; or non-special register.

(define_predicate "reg_or_u_short_operand"

  (if_then_else (match_code "const_int")

    (match_operand 0 "u_short_cint_operand")

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is any constant integer

;; or non-special register.

(define_predicate "reg_or_cint_operand"

  (ior (match_code "const_int")

       (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is a constant integer valid for addition

;; or non-special register.

(define_predicate "reg_or_add_cint_operand"

  (if_then_else (match_code "const_int")

    (match_test "(HOST_BITS_PER_WIDE_INT == 32

                  && (mode == SImode || INTVAL (op) < 0x7fff8000))

                 || ((unsigned HOST_WIDE_INT) (INTVAL (op) + 0x80008000)

                     < (unsigned HOST_WIDE_INT) 0x100000000ll)")

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is a constant integer valid for subtraction

;; or non-special register.

(define_predicate "reg_or_sub_cint_operand"

  (if_then_else (match_code "const_int")

    (match_test "(HOST_BITS_PER_WIDE_INT == 32

                  && (mode == SImode || - INTVAL (op) < 0x7fff8000))

                 || ((unsigned HOST_WIDE_INT) (- INTVAL (op)

                                               + (mode == SImode

                                                  ? 0x80000000 : 0x80008000))

                     < (unsigned HOST_WIDE_INT) 0x100000000ll)")

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if op is any 32-bit unsigned constant integer

;; or non-special register.

(define_predicate "reg_or_logical_cint_operand"

  (if_then_else (match_code "const_int")

    (match_test "(GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT

                  && INTVAL (op) >= 0)

                 || ((INTVAL (op) & GET_MODE_MASK (mode)

                      & (~ (unsigned HOST_WIDE_INT) 0xffffffff)) == 0)")

    (if_then_else (match_code "const_double")

      (match_test "GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT

                   && mode == DImode

                   && CONST_DOUBLE_HIGH (op) == 0")

      (match_operand 0 "gpc_reg_operand"))))

;; Return 1 if operand is a CONST_DOUBLE that can be set in a register

;; with no more than one instruction per word.

(define_predicate "easy_fp_constant"

  (match_code "const_double")

{

  long k[4];

  REAL_VALUE_TYPE rv;

  if (GET_MODE (op) != mode

      || (!SCALAR_FLOAT_MODE_P (mode) && mode != DImode))

    return 0;

  /* Consider all constants with -msoft-float to be easy.  */

  if ((TARGET_SOFT_FLOAT || TARGET_E500_SINGLE

      || (TARGET_HARD_FLOAT && (TARGET_SINGLE_FLOAT && ! TARGET_DOUBLE_FLOAT)))

      && mode != DImode)

    return 1;

  if (DECIMAL_FLOAT_MODE_P (mode))

    return 0;

  /* If we are using V.4 style PIC, consider all constants to be hard.  */

  if (flag_pic && DEFAULT_ABI == ABI_V4)

    return 0;

#ifdef TARGET_RELOCATABLE

  /* Similarly if we are using -mrelocatable, consider all constants

     to be hard.  */

  if (TARGET_RELOCATABLE)

    return 0;

#endif

  switch (mode)

    {

    case TFmode:

      if (TARGET_E500_DOUBLE)

        return 0;

      REAL_VALUE_FROM_CONST_DOUBLE (rv, op);

      REAL_VALUE_TO_TARGET_LONG_DOUBLE (rv, k);

      return (num_insns_constant_wide ((HOST_WIDE_INT) k[0]) == 1

              && num_insns_constant_wide ((HOST_WIDE_INT) k[1]) == 1

              && num_insns_constant_wide ((HOST_WIDE_INT) k[2]) == 1

              && num_insns_constant_wide ((HOST_WIDE_INT) k[3]) == 1);

    case DFmode:

      /* The constant 0.f is easy under VSX.  */

      if (op == CONST0_RTX (DFmode) && VECTOR_UNIT_VSX_P (DFmode))

        return 1;

      /* Force constants to memory before reload to utilize

         compress_float_constant.

         Avoid this when flag_unsafe_math_optimizations is enabled

         because RDIV division to reciprocal optimization is not able

         to regenerate the division.  */

      if (TARGET_E500_DOUBLE

          || (!reload_in_progress && !reload_completed

              && !flag_unsafe_math_optimizations))

        return 0;

      REAL_VALUE_FROM_CONST_DOUBLE (rv, op);

      REAL_VALUE_TO_TARGET_DOUBLE (rv, k);

      return (num_insns_constant_wide ((HOST_WIDE_INT) k[0]) == 1

              && num_insns_constant_wide ((HOST_WIDE_INT) k[1]) == 1);

    case SFmode:

      /* The constant 0.f is easy.  */

      if (op == CONST0_RTX (SFmode))

        return 1;

      /* Force constants to memory before reload to utilize

         compress_float_constant.

         Avoid this when flag_unsafe_math_optimizations is enabled

         because RDIV division to reciprocal optimization is not able

         to regenerate the division.  */

      if (!reload_in_progress && !reload_completed

          && !flag_unsafe_math_optimizations)

        return 0;

      REAL_VALUE_FROM_CONST_DOUBLE (rv, op);

      REAL_VALUE_TO_TARGET_SINGLE (rv, k[0]);

      return num_insns_constant_wide (k[0]) == 1;

  case DImode:

    return ((TARGET_POWERPC64

             && GET_CODE (op) == CONST_DOUBLE && CONST_DOUBLE_LOW (op) == 0)

            || (num_insns_constant (op, DImode) <= 2));

  case SImode:

    return 1;

  default:

    gcc_unreachable ();

  }

})

;; Return 1 if the operand is a CONST_VECTOR and can be loaded into a

;; vector register without using memory.

(define_predicate "easy_vector_constant"

  (match_code "const_vector")

{

  /* As the paired vectors are actually FPRs it seems that there is

     no easy way to load a CONST_VECTOR without using memory.  */

  if (TARGET_PAIRED_FLOAT)

    return false;

  if ((VSX_VECTOR_MODE (mode) || mode == TImode) && zero_constant (op, mode))

    return true;

  if (ALTIVEC_VECTOR_MODE (mode))

    {

      if (zero_constant (op, mode))

        return true;

      return easy_altivec_constant (op, mode);

    }

  if (SPE_VECTOR_MODE (mode))

    {

      int cst, cst2;

      if (zero_constant (op, mode))

        return true;

      if (GET_MODE_CLASS (mode) != MODE_VECTOR_INT)

        return false;

      /* Limit SPE vectors to 15 bits signed.  These we can generate with:

           li r0, CONSTANT1

           evmergelo r0, r0, r0

           li r0, CONSTANT2

         I don't know how efficient it would be to allow bigger constants,

         considering we'll have an extra 'ori' for every 'li'.  I doubt 5

         instructions is better than a 64-bit memory load, but I don't

         have the e500 timing specs.  */

      if (mode == V2SImode)

        {

          cst  = INTVAL (CONST_VECTOR_ELT (op, 0));

          cst2 = INTVAL (CONST_VECTOR_ELT (op, 1));

          return cst  >= -0x7fff && cst <= 0x7fff

                 && cst2 >= -0x7fff && cst2 <= 0x7fff;

        }

    }

  return false;

})

;; Same as easy_vector_constant but only for EASY_VECTOR_15_ADD_SELF.

(define_predicate "easy_vector_constant_add_self"

  (and (match_code "const_vector")

       (and (match_test "TARGET_ALTIVEC")

            (match_test "easy_altivec_constant (op, mode)")))

{

  HOST_WIDE_INT val = const_vector_elt_as_int (op, GET_MODE_NUNITS (mode) - 1);

  val = ((val & 0xff) ^ 0x80) - 0x80;

  return EASY_VECTOR_15_ADD_SELF (val);

})

;; Same as easy_vector_constant but only for EASY_VECTOR_MSB.

(define_predicate "easy_vector_constant_msb"

  (and (match_code "const_vector")

       (and (match_test "TARGET_ALTIVEC")

            (match_test "easy_altivec_constant (op, mode)")))

{

  HOST_WIDE_INT val = const_vector_elt_as_int (op, GET_MODE_NUNITS (mode) - 1);

  return EASY_VECTOR_MSB (val, GET_MODE_INNER (mode));

})

;; Return 1 if operand is constant zero (scalars and vectors).

(define_predicate "zero_constant"

  (and (match_code "const_int,const_double,const_vector")

       (match_test "op == CONST0_RTX (mode)")))

;; Return 1 if operand is 0.0.

;; or non-special register register field no cr0

(define_predicate "zero_fp_constant"

  (and (match_code "const_double")

       (match_test "SCALAR_FLOAT_MODE_P (mode)

                    && op == CONST0_RTX (mode)")))

;; Return 1 if the operand is in volatile memory.  Note that during the

;; RTL generation phase, memory_operand does not return TRUE for volatile

;; memory references.  So this function allows us to recognize volatile

;; references where it's safe.

(define_predicate "volatile_mem_operand"

  (and (and (match_code "mem")

            (match_test "MEM_VOLATILE_P (op)"))

       (if_then_else (match_test "reload_completed")

         (match_operand 0 "memory_operand")

         (if_then_else (match_test "reload_in_progress")

           (match_test "strict_memory_address_p (mode, XEXP (op, 0))")

           (match_test "memory_address_p (mode, XEXP (op, 0))")))))

;; Return 1 if the operand is an offsettable memory operand.

(define_predicate "offsettable_mem_operand"

  (and (match_operand 0 "memory_operand")

       (match_test "offsettable_nonstrict_memref_p (op)")))

;; Return 1 if the operand is a memory operand with an address divisible by 4

(define_predicate "word_offset_memref_operand"

  (match_operand 0 "memory_operand")

{

  /* Address inside MEM.  */

  op = XEXP (op, 0);

  /* Extract address from auto-inc/dec.  */

  if (GET_CODE (op) == PRE_INC

      || GET_CODE (op) == PRE_DEC)

    op = XEXP (op, 0);

  else if (GET_CODE (op) == PRE_MODIFY)

    op = XEXP (op, 1);

  return (GET_CODE (op) != PLUS

          || ! REG_P (XEXP (op, 0))

          || GET_CODE (XEXP (op, 1)) != CONST_INT

          || INTVAL (XEXP (op, 1)) % 4 == 0);

})

;; Return 1 if the operand is an indexed or indirect memory operand.

(define_predicate "indexed_or_indirect_operand"

  (match_code "mem")

{

  op = XEXP (op, 0);

  if (VECTOR_MEM_ALTIVEC_P (mode)

      && GET_CODE (op) == AND

      && GET_CODE (XEXP (op, 1)) == CONST_INT

      && INTVAL (XEXP (op, 1)) == -16)

    op = XEXP (op, 0);

  return indexed_or_indirect_address (op, mode);

})

;; Return 1 if the operand is an indexed or indirect memory operand with an

;; AND -16 in it, used to recognize when we need to switch to Altivec loads

;; to realign loops instead of VSX (altivec silently ignores the bottom bits,

;; while VSX uses the full address and traps)

(define_predicate "altivec_indexed_or_indirect_operand"

  (match_code "mem")

{

  op = XEXP (op, 0);

  if (VECTOR_MEM_ALTIVEC_OR_VSX_P (mode)

      && GET_CODE (op) == AND

      && GET_CODE (XEXP (op, 1)) == CONST_INT

      && INTVAL (XEXP (op, 1)) == -16)

    return indexed_or_indirect_address (XEXP (op, 0), mode);

  return 0;

})

;; Return 1 if the operand is an indexed or indirect address.

(define_special_predicate "indexed_or_indirect_address"

  (and (match_test "REG_P (op)

                    || (GET_CODE (op) == PLUS

                        /* Omit testing REG_P (XEXP (op, 0)).  */

                        && REG_P (XEXP (op, 1)))")

       (match_operand 0 "address_operand")))

;; Used for the destination of the fix_truncdfsi2 expander.

;; If stfiwx will be used, the result goes to memory; otherwise,

;; we're going to emit a store and a load of a subreg, so the dest is a

;; register.

(define_predicate "fix_trunc_dest_operand"

  (if_then_else (match_test "! TARGET_E500_DOUBLE && TARGET_PPC_GFXOPT")

   (match_operand 0 "memory_operand")

   (match_operand 0 "gpc_reg_operand")))

;; Return 1 if the operand is either a non-special register or can be used

;; as the operand of a `mode' add insn.

(define_predicate "add_operand"

  (if_then_else (match_code "const_int")

    (match_test "satisfies_constraint_I (op)

                 || satisfies_constraint_L (op)")

    (match_operand 0 "gpc_reg_operand")))

;; Return 1 if OP is a constant but not a valid add_operand.

(define_predicate "non_add_cint_operand"

  (and (match_code "const_int")

       (match_test "!satisfies_constraint_I (op)

                    && !satisfies_constraint_L (op)")))

;; Return 1 if the operand is a constant that can be used as the operand

;; of an OR or XOR.

(define_predicate "logical_const_operand"

  (match_code "const_int,const_double")

{

  HOST_WIDE_INT opl, oph;

  if (GET_CODE (op) == CONST_INT)

    {

      opl = INTVAL (op) & GET_MODE_MASK (mode);

      if (HOST_BITS_PER_WIDE_INT <= 32

          && GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT && opl < 0)

        return 0;

    }

  else if (GET_CODE (op) == CONST_DOUBLE)

    {

      gcc_assert (GET_MODE_BITSIZE (mode) > HOST_BITS_PER_WIDE_INT);

      opl = CONST_DOUBLE_LOW (op);

      oph = CONST_DOUBLE_HIGH (op);

      if (oph != 0)

        return 0;

    }

  else

    return 0;

  return ((opl & ~ (unsigned HOST_WIDE_INT) 0xffff) == 0

          || (opl & ~ (unsigned HOST_WIDE_INT) 0xffff0000) == 0);

})

;; Return 1 if the operand is a non-special register or a constant that

;; can be used as the operand of an OR or XOR.

(define_predicate "logical_operand"

  (ior (match_operand 0 "gpc_reg_operand")

       (match_operand 0 "logical_const_operand")))

;; Return 1 if op is a constant that is not a logical operand, but could

;; be split into one.

(define_predicate "non_logical_cint_operand"

  (and (match_code "const_int,const_double")

       (and (not (match_operand 0 "logical_operand"))

            (match_operand 0 "reg_or_logical_cint_operand"))))

;; Return 1 if op is a constant that can be encoded in a 32-bit mask,

;; suitable for use with rlwinm (no more than two 1->0 or 0->1

;; transitions).  Reject all ones and all zeros, since these should have

;; been optimized away and confuse the making of MB and ME.

(define_predicate "mask_operand"

  (match_code "const_int")

{

  HOST_WIDE_INT c, lsb;

  c = INTVAL (op);

  if (TARGET_POWERPC64)

    {

      /* Fail if the mask is not 32-bit.  */

      if (mode == DImode && (c & ~(unsigned HOST_WIDE_INT) 0xffffffff) != 0)

        return 0;

      /* Fail if the mask wraps around because the upper 32-bits of the

         mask will all be 1s, contrary to GCC's internal view.  */

      if ((c & 0x80000001) == 0x80000001)

        return 0;

    }

  /* We don't change the number of transitions by inverting,

     so make sure we start with the LS bit zero.  */

  if (c & 1)

    c = ~c;

  /* Reject all zeros or all ones.  */

  if (c == 0)

    return 0;

  /* Find the first transition.  */

  lsb = c & -c;

  /* Invert to look for a second transition.  */

  c = ~c;

  /* Erase first transition.  */

  c &= -lsb;

  /* Find the second transition (if any).  */

  lsb = c & -c;

  /* Match if all the bits above are 1's (or c is zero).  */

  return c == -lsb;

})

;; Return 1 for the PowerPC64 rlwinm corner case.

(define_predicate "mask_operand_wrap"

  (match_code "const_int")

{

  HOST_WIDE_INT c, lsb;

  c = INTVAL (op);

  if ((c & 0x80000001) != 0x80000001)

    return 0;

  c = ~c;

  if (c == 0)

    return 0;

  lsb = c & -c;

  c = ~c;

  c &= -lsb;

  lsb = c & -c;

  return c == -lsb;

})

;; Return 1 if the operand is a constant that is a PowerPC64 mask

;; suitable for use with rldicl or rldicr (no more than one 1->0 or 0->1

;; transition).  Reject all zeros, since zero should have been

;; optimized away and confuses the making of MB and ME.

(define_predicate "mask64_operand"

  (match_code "const_int")

{

  HOST_WIDE_INT c, lsb;

  c = INTVAL (op);

  /* Reject all zeros.  */

  if (c == 0)

    return 0;

  /* We don't change the number of transitions by inverting,

     so make sure we start with the LS bit zero.  */

  if (c & 1)

    c = ~c;

  /* Find the first transition.  */

  lsb = c & -c;

  /* Match if all the bits above are 1's (or c is zero).  */

  return c == -lsb;

})

;; Like mask64_operand, but allow up to three transitions.  This

;; predicate is used by insn patterns that generate two rldicl or

;; rldicr machine insns.

(define_predicate "mask64_2_operand"

  (match_code "const_int")

{

  HOST_WIDE_INT c, lsb;

  c = INTVAL (op);

  /* Disallow all zeros.  */

  if (c == 0)

    return 0;

  /* We don't change the number of transitions by inverting,

     so make sure we start with the LS bit zero.  */

  if (c & 1)

    c = ~c;

  /* Find the first transition.  */

  lsb = c & -c;

  /* Invert to look for a second transition.  */

  c = ~c;

  /* Erase first transition.  */

  c &= -lsb;

  /* Find the second transition.  */

  lsb = c & -c;

  /* Invert to look for a third transition.  */

  c = ~c;

  /* Erase second transition.  */

  c &= -lsb;

  /* Find the third transition (if any).  */

  lsb = c & -c;

  /* Match if all the bits above are 1's (or c is zero).  */

  return c == -lsb;

})

;; Like and_operand, but also match constants that can be implemented

;; with two rldicl or rldicr insns.

(define_predicate "and64_2_operand"

  (ior (match_operand 0 "mask64_2_operand")

       (if_then_else (match_test "fixed_regs[CR0_REGNO]")

         (match_operand 0 "gpc_reg_operand")

         (match_operand 0 "logical_operand"))))

;; Return 1 if the operand is either a non-special register or a

;; constant that can be used as the operand of a logical AND.

(define_predicate "and_operand"

  (ior (match_operand 0 "mask_operand")

       (ior (and (match_test "TARGET_POWERPC64 && mode == DImode")

                 (match_operand 0 "mask64_operand"))

            (if_then_else (match_test "fixed_regs[CR0_REGNO]")

              (match_operand 0 "gpc_reg_operand")

              (match_operand 0 "logical_operand")))))

;; Return 1 if the operand is either a logical operand or a short cint operand.

(define_predicate "scc_eq_operand"

  (ior (match_operand 0 "logical_operand")

       (match_operand 0 "short_cint_operand")))

;; Return 1 if the operand is a general non-special register or memory operand.

(define_predicate "reg_or_mem_operand"

     (ior (match_operand 0 "memory_operand")

          (ior (and (match_code "mem")

                    (match_test "macho_lo_sum_memory_operand (op, mode)"))

               (ior (match_operand 0 "volatile_mem_operand")

                    (match_operand 0 "gpc_reg_operand")))))

;; Return 1 if the operand is either an easy FP constant or memory or reg.

(define_predicate "reg_or_none500mem_operand"

  (if_then_else (match_code "mem")

     (and (match_test "!TARGET_E500_DOUBLE")

          (ior (match_operand 0 "memory_operand")

               (ior (match_test "macho_lo_sum_memory_operand (op, mode)")

                    (match_operand 0 "volatile_mem_operand"))))

     (match_operand 0 "gpc_reg_operand")))

;; Return 1 if the operand is CONST_DOUBLE 0, register or memory operand.

(define_predicate "zero_reg_mem_operand"

  (ior (match_operand 0 "zero_fp_constant")

       (match_operand 0 "reg_or_mem_operand")))

;; Return 1 if the operand is a general register or memory operand without

;; pre_inc or pre_dec or pre_modify, which produces invalid form of PowerPC

;; lwa instruction.

(define_predicate "lwa_operand"

  (match_code "reg,subreg,mem")

{

  rtx inner = op;

  if (reload_completed && GET_CODE (inner) == SUBREG)

    inner = SUBREG_REG (inner);

  return gpc_reg_operand (inner, mode)

    || (memory_operand (inner, mode)

        && GET_CODE (XEXP (inner, 0)) != PRE_INC

        && GET_CODE (XEXP (inner, 0)) != PRE_DEC

        && (GET_CODE (XEXP (inner, 0)) != PRE_MODIFY

            || legitimate_indexed_address_p (XEXP (XEXP (inner, 0), 1), 0))

        && (GET_CODE (XEXP (inner, 0)) != PLUS

            || GET_CODE (XEXP (XEXP (inner, 0), 1)) != CONST_INT

            || INTVAL (XEXP (XEXP (inner, 0), 1)) % 4 == 0));

})

;; Return 1 if the operand, used inside a MEM, is a SYMBOL_REF.

(define_predicate "symbol_ref_operand"

  (and (match_code "symbol_ref")

       (match_test "(mode == VOIDmode || GET_MODE (op) == mode)

                    && (DEFAULT_ABI != ABI_AIX || SYMBOL_REF_FUNCTION_P (op))")))

;; Return 1 if op is an operand that can be loaded via the GOT.

;; or non-special register register field no cr0

(define_predicate "got_operand"

  (match_code "symbol_ref,const,label_ref"))

;; Return 1 if op is a simple reference that can be loaded via the GOT,

;; excluding labels involving addition.

(define_predicate "got_no_const_operand"

  (match_code "symbol_ref,label_ref"))

;; Return 1 if op is a SYMBOL_REF for a TLS symbol.

(define_predicate "rs6000_tls_symbol_ref"

  (and (match_code "symbol_ref")

       (match_test "RS6000_SYMBOL_REF_TLS_P (op)")))

;; Return 1 if the operand, used inside a MEM, is a valid first argument

;; to CALL.  This is a SYMBOL_REF, a pseudo-register, LR or CTR.

(define_predicate "call_operand"

  (if_then_else (match_code "reg")

     (match_test "REGNO (op) == LR_REGNO

                  || REGNO (op) == CTR_REGNO

                  || REGNO (op) >= FIRST_PSEUDO_REGISTER")

     (match_code "symbol_ref")))

;; Return 1 if the operand is a SYMBOL_REF for a function known to be in

;; this file.

(define_predicate "current_file_function_operand"

  (and (match_code "symbol_ref")

       (match_test "(DEFAULT_ABI != ABI_AIX || SYMBOL_REF_FUNCTION_P (op))

                    && ((SYMBOL_REF_LOCAL_P (op)

                         && (DEFAULT_ABI != ABI_AIX

                             || !SYMBOL_REF_EXTERNAL_P (op)))

                        || (op == XEXP (DECL_RTL (current_function_decl),

                                                  0)))")))

;; Return 1 if this operand is a valid input for a move insn.

(define_predicate "input_operand"

  (match_code "label_ref,symbol_ref,const,high,reg,subreg,mem,

               const_double,const_vector,const_int,plus")

{

  /* Memory is always valid.  */

  if (memory_operand (op, mode))

    return 1;

  /* For floating-point, easy constants are valid.  */

  if (SCALAR_FLOAT_MODE_P (mode)

      && CONSTANT_P (op)

      && easy_fp_constant (op, mode))

    return 1;

  /* Allow any integer constant.  */

  if (GET_MODE_CLASS (mode) == MODE_INT

      && (GET_CODE (op) == CONST_INT

          || GET_CODE (op) == CONST_DOUBLE))

    return 1;

  /* Allow easy vector constants.  */

  if (GET_CODE (op) == CONST_VECTOR

      && easy_vector_constant (op, mode))

    return 1;

  /* Do not allow invalid E500 subregs.  */

  if ((TARGET_E500_DOUBLE || TARGET_SPE)

      && GET_CODE (op) == SUBREG

      && invalid_e500_subreg (op, mode))

    return 0;

  /* For floating-point or multi-word mode, the only remaining valid type

     is a register.  */

  if (SCALAR_FLOAT_MODE_P (mode)

      || GET_MODE_SIZE (mode) > UNITS_PER_WORD)

    return register_operand (op, mode);

  /* The only cases left are integral modes one word or smaller (we

     do not get called for MODE_CC values).  These can be in any

     register.  */

  if (register_operand (op, mode))

    return 1;

  /* A SYMBOL_REF referring to the TOC is valid.  */

  if (legitimate_constant_pool_address_p (op))

    return 1;

  /* A constant pool expression (relative to the TOC) is valid */

  if (toc_relative_expr_p (op))

    return 1;

  /* V.4 allows SYMBOL_REFs and CONSTs that are in the small data region

     to be valid.  */

  if (DEFAULT_ABI == ABI_V4

      && (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == CONST)

      && small_data_operand (op, Pmode))

    return 1;

  return 0;

})

;; Return true if OP is an invalid SUBREG operation on the e500.

(define_predicate "rs6000_nonimmediate_operand"

  (match_code "reg,subreg,mem")

{

  if ((TARGET_E500_DOUBLE || TARGET_SPE)

      && GET_CODE (op) == SUBREG

      && invalid_e500_subreg (op, mode))

    return 0;

  return nonimmediate_operand (op, mode);

})

;; Return true if operand is boolean operator.

(define_predicate "boolean_operator"

  (match_code "and,ior,xor"))

;; Return true if operand is OR-form of boolean operator.

(define_predicate "boolean_or_operator"

  (match_code "ior,xor"))

;; Return true if operand is an equality operator.

(define_special_predicate "equality_operator"

  (match_code "eq,ne"))

;; Return true if operand is MIN or MAX operator.

(define_predicate "min_max_operator"

  (match_code "smin,smax,umin,umax"))

;; Return 1 if OP is a comparison operation that is valid for a branch

;; instruction.  We check the opcode against the mode of the CC value.

;; validate_condition_mode is an assertion.

(define_predicate "branch_comparison_operator"

   (and (match_operand 0 "comparison_operator")

        (and (match_test "GET_MODE_CLASS (GET_MODE (XEXP (op, 0))) == MODE_CC")

             (match_test "validate_condition_mode (GET_CODE (op),

                                                   GET_MODE (XEXP (op, 0))),

                          1"))))

(define_predicate "rs6000_cbranch_operator"

  (if_then_else (match_test "TARGET_HARD_FLOAT && !TARGET_FPRS")

                (match_operand 0 "ordered_comparison_operator")

                (match_operand 0 "comparison_operator")))

;; Return 1 if OP is a comparison operation that is valid for an SCC insn --

;; it must be a positive comparison.

(define_predicate "scc_comparison_operator"

  (and (match_operand 0 "branch_comparison_operator")

       (match_code "eq,lt,gt,ltu,gtu,unordered")))

;; Return 1 if OP is a comparison operation that is valid for a branch

;; insn, which is true if the corresponding bit in the CC register is set.

(define_predicate "branch_positive_comparison_operator"

  (and (match_operand 0 "branch_comparison_operator")

       (match_code "eq,lt,gt,ltu,gtu,unordered")))

;; Return 1 if OP is a load multiple operation, known to be a PARALLEL.

(define_predicate "load_multiple_operation"

  (match_code "parallel")

{

  int count = XVECLEN (op, 0);

  unsigned int dest_regno;

  rtx src_addr;

  int i;

  /* Perform a quick check so we don't blow up below.  */

  if (count <= 1

      || GET_CODE (XVECEXP (op, 0, 0)) != SET

      || GET_CODE (SET_DEST (XVECEXP (op, 0, 0))) != REG

      || GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) != MEM)

    return 0;

  dest_regno = REGNO (SET_DEST (XVECEXP (op, 0, 0)));

  src_addr = XEXP (SET_SRC (XVECEXP (op, 0, 0)), 0);

  for (i = 1; i < count; i++)

    {

      rtx elt = XVECEXP (op, 0, i);

      if (GET_CODE (elt) != SET

          || GET_CODE (SET_DEST (elt)) != REG

          || GET_MODE (SET_DEST (elt)) != SImode

          || REGNO (SET_DEST (elt)) != dest_regno + i